js实现点击上传图片

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>图片上传</title>
</head>
<body>
    <input type="file" id="fileInput" accept="image/*" multiple>
    <button id="uploadButton">上传图片</button>
    <div id="preview"></div>
    <script src="script.js"></script>
</body>
</html>

document.getElementById('uploadButton').addEventListener('click', function() {
    document.getElementById('fileInput').click();
});

document.getElementById('fileInput').addEventListener('change', function(event) {
    const files = event.target.files;
    const preview = document.getElementById('preview');
    preview.innerHTML = ''; // 清空之前的预览

    for (let i = 0; i < files.length; i++) {
        const file = files[i];
        if (file.type.startsWith('image/')) {
            const reader = new FileReader();
            reader.onload = (function(file) {
                return function(e) {
                    const img = document.createElement('img');
                    img.src = e.target.result;
                    img.alt = file.name;
                    img.style.width = '100px'; // 设置预览图片的大小
                    preview.appendChild(img);
                };
            })(file);
            reader.readAsDataURL(file);
        }
    }
});

const express = require('express');
const multer = require('multer');
const path = require('path');

const app = express();
const storage = multer.diskStorage({
    destination: function(req, file, cb) {
        cb(null, 'uploads/');
    },
    filename: function(req, file, cb) {
        cb(null, Date.now() + path.extname(file.originalname)); // 使用时间戳避免文件名冲突
    }
});

const upload = multer({ storage: storage });

app.post('/upload', upload.array('images'), (req, res) => {
    res.send('Files uploaded successfully');
});

app.listen(3000, () => console.log('Server started on port 3000'));